Adjustable scaffold-bracket.



UNITED STATES PATENT OFFICE.

JOHN J. DENNIS, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO F. W.

FULLMER AND F. E. BALL, OF

CHICAGO, ILLINOIS.

ADJUSTABLE SCAFFOLD-BRAOKET.

Specification of Letters Patent.

Patented May 14., 1907.

Application filed October 26,1905. Serial No. 284,482.

To all whom 2125 may concern:

Be it known that I, JOHN J. DENNIS, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Adjustable Scaffold-Brackets; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification,

This invention relates to improvements in adjustable scaffold brackets of that class adapted to be adjustably secured upon a suitable support therefor.

Scaffold brackets heretofore constructed have not usually been capable of ready adjustment to different sizes of upright or variously inclined supports and this has freqliliently occasioned inconvenience. Furt ermore the brackets heretofore devised for this purpose have not been extensible to in crease the length of the bracket or afford a wider scaffold.

The object of this invention is to afford a scaffold or other bracket either for inside or outside use capable of adjustment instantaneously to its support to enable a horizontal scaffold. to be built thereon independent of the inclination of the support from a perpendicular.

It is a further object of the invention to so construct a bracket as to enable it to be quickly adjusted to different thicknesses of the supports and also to so construct it that should the plank or other support be warped or sprung transversely the same will nevertheless be firmly engaged by the bracket.

Furthermore, inasmuch as in building scaffolds it frequently is very desirable to afford a guard or lateral support to prevent tools or materials used by the workmen from falling from the scaffold it is an object of the invention to rovide means for accomplishing this and a so to enable the width of the scaffold to be increased should it be desired.

It is a further object of the invention to afford a support capable of bein knocked down into very small compass an affording a very strong, simple and durable construction affording maximum safety to the user and at all times affording binding engagement upon its support and incapable of slipping.

The invention consists in the matters hereinafter described and more fully pointed out and defined in the appended claimsf In the drawings: Fi ure 1 is a side elevation of a device embodying my inventionin use showing the extension arm retracted. Fig. 2 is a top plan view of the same with thesupport and staging lank removed. Fig. 3 is a section taken on ine 3-3 of Fig. 2 with the extension arm turned outwardly and its adjustment indicated in dotted lines. Fig. 4 is a section taken on line 4-4 of Fig. 2. Fig. 5 is a side elevation of brackets embodying my invention showing the same employed to afford a temporary stairway. Fig. 6 is a side elevation showing the brackets employed to afford a scaffold both on the inner and outer side of the support.

As shown in said drawings: A, A and A indicate inclined supports which may be plank or other dimension stuff or any suitable support, arranged to incline or perpendicularly as preferred. Secured on-said supports are the brackets which comprise two relatively adjustable jaws B-C= The outer jaw B is provided with integral arms I) which extend downwardly, then horizontally and rearwardly from the jaw and as shown are provided on the under side thereof from a point below the gripping edge of the jaw with forwardly and downwardly inclined notches b. The jaw B is provided on its inner edge and near its ends with a plurality of sharp teeth b and as shown nearer the middle of the head with longer teeth b be tween which at the middle of the jaw the edge curves slightly inward and is provided with finer teeth 1) adapted to engage the plank or other sup ort should the same be slightly warped. t the extremity of each arm I) and on the inner side of the same is an integral or other suitable stud b to afford means for slidably engaging the complemental jaw O therewith. The inner jaw O as shown, is curved oppositely at its middle from the jaw B and is provided with teeth c 0 and 0 corresponding with the teeth 5 b and b on the outer jaw B and said jaw C inclines obliquely downward and forwardly to engage the support at an angle with the plane of the jaw B thus engaging the support at an effective angle, and when weight is applied to the bracket forcing the teeth on each jaw into the support. jaw C is provided at its ends with inte ral extensions 0 adapted to engage in the s ots or notches b in the arms 6 and plate 0 is provided thereon whi upwardly on the outer side of t acts to hold the arms from to spread. Integrally connected with the jaw U are rearwardly directed lon slotted arms 0 tlnough wh studs 6 which are perman engagement therewith by means of a washer c Said washersare permanentl on the studs b 'by riveting the e studs down thereon. The rear ends of the arms 0 are each integrally connected with a rear bar or rail 0 the inner or ad of which are connected by means of a pivot .01 bolt d on which is pivoted an extension gagement on a downwardly directed rib (Z on the rails 0 acts to support the arm in adjusted position either horizontally or at a desired inclination as shown in dotted lines 1n Fig. 3.

The operation is as follows: The plank or shown in Fig. 5, the angle may be such as will be'suitable for such a purpose.

in building either inside or with a single plank for a sta with the top of the bracket 6 and a scaff width provi ed by placing an additional plank 1t" thereon, or an additional bracket shown in Fi may be engaged on the Inner face of the sup port A adjacent the wall, as shown and a plank E supported there .viding a staging on both sides 0 and the staging may be made Said an integral ch extends he arm and any tendency gitudinally ich extend said ently secured in y engaged nds of the j acent ends The the outer PP ack- The extended projections c on'the jaw O in any case engage in the notches below shown in Fig. l and firmly h adjusted position. Two suc sets of brackets having been relation, planks E-E may be laid the same to afford steps as shown.

Ordinarily, of course, the brackets are used outside scaffolds d may be used ging or the width may be increased either by turning the ex the arms 6 as h supports and proper across arms b-c as old of double in Fig. 6, 121.: was prosides, a coacting jaw, arms thereon extending upport 1n the same direction as the aforesaid arms still wider by and lying within the same, laterally directed the use of the extension arm on the last Obviously the brackets or jaws may be arranged or adjustment toward or from each I claim as my invention:

prising relatively adjustable jaws having inwardly facing engaging edges thereon and in tegral slidably engaged arms on said jaws extending in the same direction and adapted to afford a support.

2. A device of the class described comprising rel atively. adjustable jaws having inwardly 4. A scaffold bracket of the class described comprising relatively adjustable jaws having inwardly directed toothed edges adapted to engage a supporting member therebetween,

aiiording a support for a staging.

5. A bracket comprising adjustable jaws adapted to grip an inclined support therebetween, means rigidly engaging the jaws in adjusted relation and a rigid arm on each end of each jaw together affording a substantially horizontal staging support those on one jaw being slidably and pivotally engaged with those on the other.

spreading, the arms of one or both of said jaws being rigidly connected at the rear end. 7. In a device of the class described. the

1. A bracket of the class described comadapted to prevent the outer arms from extensions on the ends of said last named jaw adapted to engage in said notches and devices on the first named arms slidably connected in the last named arms.

8. In a device of the class described the combination with a jaw having inward directed teeth for the entire length. thereof, rearwardly extending arms engaged thereto and extending in a different plane from the plane of said jaw, a jaw having inward di rected teeth corresponding with the teeth on the-aforesaid jaw, rearward extending, slotted. arms connected with the last named jaw, an extension on one end of each of said arms and. a plate on each extension adapted to prevent the first named arms from spreading laterally.

9. In a device of the class described the combination with a jaw having inward directed teeth of different sizes, an arm on each end of said jaw, a lug on each end of said jaw a jaw having inward directed teeth, arms rigidly engaged to said last named jaw and notched to engage said lugs and means on said last named arms adapted to engage in the slots of the first named arms thereby permitting different adjustments.

10. As an article of manufacture an extensible bracket of the class described having relatively adjustable gripping jaws adapted clampingly to engage a support, one of said jaws being arranged at an angle With-the plane of the other and pivotally and slidably connected therewith.

11. As an article of manufacture a bracket of the class described embracing relatively adjustable gripping jaws having toothed edges and adapted to clampingly engage a supporting element, one of said jaws being arranged obliquely with the plane of the other, slotted arms on one jaw provided with a lateral projection on the inner end of each arm, a plate rigidly engaged to said projec tion, notched arms on the other jaw adapted to engage on said projections for rigidly holding said jaws in adjusted position and provided with pins at their outer ends slidably and pivotally connected in said slots.

12'. The combination with an outer jaw having the engaging edge horizontally directed, of an,inner jaw having an obliquely and outwardly directed engaging edge, slotted and notched arms on said jaws slidingly engaged together and affording a scaffold support and laterally directed projections on said arms adapted to engage in said slots and notches.

13. In a device of the class described a scaffold bracket or clamp having complemental engaging jaws arranged at an angle with each other, integral arms engaged to the ends of said jaws affording a scafi'old support and the arms of one jaw slidable longitudinally of the other, the arms on one jaw being notched and those on the other slotted.,'65

means on said arms adapted to engage in said slots and notches and hold the jaws in adjusted position, an extensible arm pivoted on the rear end of said, arms on one jaw and a segment thereon affording adjustment of the same relatively of said arm.

1.4:. In a device of the class described the combination with a plurality of jaws, slotted arms rigidly engaged on the ends of one jaw,

notched arms integral with the ends of the other jaw, a rod connecting the extremities of said slotted arms, an extension arm pivoted centrally on said rod and having a plurality of apertures arranged on the pivoted end and means for engaging any one of said aper- 8o tures and adapting said arm to be adjusted at any angle.

15. In a device of the class described the I combination with a jaw having parallel, slotted arms thereon integrally connected at their outer ends, a coacting jaw having par allel, notched arms thereon slidably engaged on the outer side of the aforesaid arms, studs on said notched arms slidably engaged in the slots of the first named'arms and means on 0 JOHN J DENNIS.

Witnesses:

O. HILLS, W. W. WITHENBURY. 

